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Description of business and basis of preparation of the consolidated financial statements - Subsidiaries (Details) | 11 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2017
Telecom USA |  |  |
Description of business and basis of preparation of the consolidated financial statements |  |  |
Percentage of capital stock owned and voting rights |  | 100.00% |
Micro Sistemas |  |  |
Description of business and basis of preparation of the consolidated financial statements |  |  |
Percentage of capital stock owned and voting rights |  | 100.00% |
Personal |  |  |
Description of business and basis of preparation of the consolidated financial statements |  |  |
Percentage of capital stock owned and voting rights | 100.00% |  |
Nucleo |  |  |
Description of business and basis of preparation of the consolidated financial statements |  |  |
Percentage of capital stock owned and voting rights |  | 67.50% |
Percentage of ownership interest held by a noncontrolling interest |  | 32.50% |
Nucleo | Tuves Paraguay |  |  |
Description of business and basis of preparation of the consolidated financial statements |  |  |
Acquisition percentage |  |  | 70.00%
Personal Envios |  |  |
Description of business and basis of preparation of the consolidated financial statements |  |  |
Percentage of capital stock owned and voting rights |  | 67.50% |
Percentage of ownership interest held by a noncontrolling interest |  | 32.50% |
Tuves Paraguay |  |  |
Description of business and basis of preparation of the consolidated financial statements |  |  |
Percentage of capital stock owned and voting rights |  | 47.25% |
Tuves Paraguay | ABC Telecomunicaciones |  |  |
Description of business and basis of preparation of the consolidated financial statements |  |  |
Percentage of ownership interest held by a noncontrolling interest |  | 22.75% |
Tuves Paraguay | TU VES S.A. (Chile) |  |  |
Description of business and basis of preparation of the consolidated financial statements |  |  |
Percentage of ownership interest held by a noncontrolling interest |  | 30.00% |

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